Final report on EURAMET.T-K3.5: Bilateral comparison of SPRT calibration at the ITS-90 Fixed Points of Ar, Hg, H2O, Ga, In, Sn, Zn and Al

ROTH+CO. AG (Switzerland) was designated by METAS for participation in the MRA in the field of thermometry. To demonstrate its technical competence, ROTH+CO. AG asked VSL (the Netherlands) for a bilateral comparison of SPRT calibration at the ITS-90 fixed points of Ar, Hg, H2O, Ga, In, Sn, Zn and Al. The comparison, designated as EURAMET.T-K3.5, was initiated in February 2013 (with the preparation of the technical protocol) and completed in July 2014 (with the CCT approval of the final report). The results showed a satisfactory degree of equivalence between VSL and ROTH+CO. AG, and were successfully linked to EUROMET.T-K3 and CCT-K3 key comparisons. As a consequence, ROTH+CO. AG is now able to support CMCs for the services covered by this comparison and publish them in the KCDB. Main text. To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database kcdb.bipm.org/. The final report has been peer-reviewed and approved for publication by the CCT, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).